I have this error on King Arthur Collection always after second battle (Win 7 64bit system 8gb memory ram, and graphic card memory 1gb) How fix it? I tried everything - reinstalled game and visual C++ 64x, Direct x, n-vidia physics without effects

n-vidia PhysX should make absolutely no difference, nor should visual c++

You ought to ensure you have run the DirectX Updater since you are using Windows 7, also Ensure you have up-to-date MSVC Runtime components required by the game (The installers for these should be packaged with KAtRPWG)

You haven't mentioned what DLC you have or what graphics settings you run the game in - these may well be a factor.